ENERGY ANALYSIS OF THE INTERACTION OF ESTRADIOL AND DIETILESTILBESTROL WITH ERα
Estradiol. Diethylstilbestrol. Estrogen receptor alpha. Breast cancer. MFCC. DFT.
Breast cancer and a hormone-dependent disease, which has several different subtypes, patterns of gene expression and distinct manifestations (CHENG et al., 2002). According to the National Cancer Institute (INCA), in the year 2013, as deaths caused by the disease of 14,388, being 181 men and 14,207. The estimate for 2015 is 57,120 of new cases. Most breast cancers are ER + (estrogen receptor positive), ie, 17β-estradiol dependent. In this type of breast neoplasm, the number of ERα (estrogen receptor alpha subtype) is higher than the number of ERβ (estrogen receptor beta subtype), evidencing the importance of the alpha subtype in this disease. The purpose of this work is to measure the individual binding energies of ERα residues with 17β-estradiol and Diethylstilbestrol, using a computational simulation. For this purpose, it is employed as Doria of Functional Theory (DFT) and Molecular Fractionation Method with Conjugated Caps (MFCC). The results obtained with this work may help to characterize the interaction between the 17β-estradiol agonists and Diethylstilbestrol with ERα. The results obtained showed the residues with the most significant energy values are: GLU353, LEU391, MET343, LEU346, MET388, ARG394, PHE404, HIS524, ASP411, LEU525, ARG352 and ARG548. These results help characterize, through the information obtained, an interaction between 17β-estradiol and Diethylstilbestrol with ERα and, in turn, can be used as a basis for studies, structural drug design, modulate existing drugs, such as for the design of new drugs.